If you (or a good friend) has hydrangea bushes, you need to start thinking about clipping flowers to dry. You'll be able to use them here and there in your booth to make the things you hope to sell look even prettier. Dry some extra to use at home!
Here are some interesting jewelry displays I came across recently -
Finally, this is not a display idea, but rather a trick for transporting jewelry displays. I actually found this in an article with moving tips. If you do shows, setting up needs to be fast and easy. You could get a display ready and wrap it with Press-n-Seal to keep everything in place til you are ready to set up.